<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片式图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false">
      </el-alert>

      <!-- 选择商品区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{ expandTrigger: 'hover', 
                value: 'cat_id',
                label: 'cat_name',
                children: 'children', 
                checkStrictly: true }"
            @change="handleChange">
          </el-cascader>

        </el-col>
      </el-row>

      <!-- Tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type='primary' size='mini' :disabled='idBtnDisabled' @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数的表格 -->
          <el-table :data='manyTabData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag closable v-for="(item,index) in scope.row.attr_vals" 
                :key="index" @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>

                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type='index'></el-table-column>
            <el-table-column label='参数名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope="scope">
                <el-button size='mini' type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size='mini' type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type='primary' size='mini' :disabled='idBtnDisabled' @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性的表格 -->
          <el-table :data='onlyTabData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
              <template slot-scope="scope">
                <el-tag closable v-for="(item,index) in scope.row.attr_vals" 
                :key="index" @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>

                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type='index'></el-table-column>
            <el-table-column label='属性名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope="scope">
                <el-button size='mini' type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size='mini' type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
       
       </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close='addDialogClosed'>
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close='editDialogClosed'>
      <!-- 修改参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return{
        // 商品分类列表
        cateList: [],
        // 级联选择框双向绑定的数组
        selectedCateKeys: [],
        // 被激活的页签的名称
        activeName: 'many',
        // 动态参数的数据
        manyTabData: [],
        // 静态属性的数据
        onlyTabData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible:false,
        // 添加参数的表单数据对象
        addForm: {
          attr_name: '',
        },
        // 添加表单的验证规则对象
        addFormRules: {
          attr_name:[
            {
              required: true,
              message: '请输入参数名称',
              trigger: 'blur'
            }
          ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改的表单数据对象
        editForm: {},
        // 修改表单的验证规则对象
        editFormRules: {
          attr_name:[
            {
              required: true,
              message: '请输入参数名称',
              trigger: 'blur'
            }
          ]
        },
        // 

      }
    },
    created() {
      // 获取所有的商品分类列表
      this.getCateList()
    },
    computed:{
      // 如果按你需要被禁用，则返回true
      idBtnDisabled() {
        if(this.selectedCateKeys.length !== 3){
          return true
        }
        return false
      },
      // 当前分类的三级分类的id
      cateId() {
        if(this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 动态计算标题的文本
      titleText() {
        if(this.activeName === 'many') {
          return '动态参数'
        } else {
          return '静态属性'
        }
      }
    },
    methods:{
      async getCateList() {
        const {data:res} = await this.$http.get('categories')
        if(res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }
        // 把数值列表赋值给cateList
        this.cateList = res.data
      },
      // 级联选项发生变化触发这个函数 
      handleChange() {
        this.getParamsDate()
      },
      // tab页签点击事件的处理函数
      handleTabClick() {
        this.getParamsDate()
      },
      // 获取参数的列表数据
      async getParamsDate() {
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTabData = []
          this.onlyTabData = []
          return
        }
        // 根据所选分类的id，和当前所处的面板，获取对应的参数
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel: this.activeName}})
        if(res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！')
        }

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          item.inputValue = ''
        })

        // console.log(res.data);
        if(this.activeName === 'many') {
          this.manyTabData = res.data
        } else {
          this.onlyTabData = res.data
        }
      },
      // 监听添加参数对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 点击按钮添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if(!valid) return
          const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,
                {attr_name: this.addForm.attr_name, attr_sel: this.activeName})
          if(res.meta.status !== 201) {
            return this.$message.error('添加参数失败！')
          }

          this.$message.success('添加参数成功')
          this.getParamsDate()
          this.addDialogVisible = false
        })
      },
      // 点击按钮展示修改对话框
      async showEditDialog(attr_id) {
        // 查询当前参数的信息
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
          {params: {attr_sel: this.activeName}})
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数信息失败！')
        }

        this.editForm = res.data
        this.editDialogVisible = true
      },
      // 重置修改的表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮，修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if(!valid) return
          const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {attr_name: this.editForm.attr_name, attr_sel: this.activeName})
          if(res.meta.status !== 200) {
            return this.$message.error('修改参数失败！')
          }

          this.$message.success('修改参数成功')
          this.getParamsDate()
          this.addDialogVisible = false
        })
      },
      // 根据id 删除对应的参数项 
      async removeParams(attr_id) {
        // 弹框询问参数是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).catch(err => err)

      // 如果参数确认了删除，则返回值为字符串 confirm
      // 如果参数取消了删除，则返回值为字符串 cancel
      if(confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      const {data :res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) {
          return this.$message.error("删除参数失败！");
      }
      // 重新获取参数列表数据
      this.getParamsDate();
      this.$message.success("删除参数成功");
      },
      // 文本框失去焦点，或摁下Enter都会触发
      async handleInputConfirm(row) {
        if(row.inputValue.trim().length === 0){
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        // 如果没有return ，则输入的内容需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false

        // 需要发起请求保存 
        this.saveAttrVals(row)
      },
      // 将对 attr_vals的操作保存到数据库
      async saveAttrVals(row){
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
          {attr_name: row.attr_name, 
           attr_sel: row.attr_sel,
           attr_vals: row.attr_vals.join(' ')})
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数项失败！')
        }

        this.$message.success('修改参数项成功')
      },
      // 点击按钮展示文本输入框
      showInput(row) {
        row.inputVisible = true
        // 让文本框自动获取焦点
        //  $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick( () => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      // 删除对应的参数可选项
      handleClose(i,row){
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      }

    }
  }
</script>

<style scoped>
.cat_opt {
  margin: 20px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;

}
</style>